Synthesis Of ZnO Nanoparticles By Hyperbranched Polymer And Its Application On Silk Fabric Functional Finishing

Silk fiber is a kind of natural protein fiber, has great affinity with the human skin,known as “fiber queen”. Silk fiber is highly popular with people and widely used in dailylife owning to its excellent properties, such as softness, gorgeous appearance, excellent wetabsorption properties and so on. Silk products easily yellowed in sunlight, which hasgreatly bad effect on its appearance and properties.Therefore, it’s very important to designand modify silk fiber in some way to provide the silk fabrics with improved properties toovercome the above mentioned problems.In this paper, HBP-NH2and zinc nitrate were utilized as reagents to fabricate ZnO in aone-step reaction. The ZnO aqueous solution were characterized by X-ray diffraction(XRD)、 UV-visible spectroscopy (UV-Vis)、 Nano Sizer and Transmission ElectronMicroscope (TEM). The effect of concentration ratio of reactants on size distribution andstability of nano ZnO was discussed.The results demonstrated that the average diameter ofZnO nanoparticle was at about45nm and it also had good evenness and stability.The pad-dry-cure method and microwave method were used to treat the silk fabric.The antibacterial activity and UV protective property of the treated fabrics were measured.SEM and EDS were employed to observe the morphology and element content of thetreated fabrics. The results demonstrated that the UV protective property and washingresistance of the microwave treated silk fabrics are better than pad-dry-cure method. ZnOcontent of the treated fabric was5.30%, UPF value reached131.13, UVA and UVBtransmittance decreased to3.43%and0.64%, with excellent UV protective property. Inaddition, ZnO content of the fabric decreased to3.48%and UPF (Ultraviolet ProtectionFactor) value still above the fabric40after being washed50times consecutively on home laundering conditions. The treated silk fabric has excellent UV protective property andgood antibacterial properties against Staphylococcus aureus and Escherichia coli. After theoptimum finishing process, the treated silk fabrics hardly have changed in its thermal andmechanical properties, water vapour transmission fell slightly.